Hi everyoneI have recently upgraded to an i7-2600K o/c to a stable 4.2 Ghz. My 285 GTX graphic card is playing up so I will be buying a new card in the near future. I am running Win 7 64 bit and have 8Gb of 1600hz DDR3 Corsair ram. I understand that as FSX is a 32 bit programme it can only use just under 4Gb of ram which will be divided between the main ram and the graphic card ram. My current card has 1Gb of ram and my question is am I better of buying a new card with the same amount of ram or buying a card with more ram? I'm not thinking of buying a card with a lot more ram but of possibly buying one with a slight increase in ram. My reasoning for considering this is that the NGX uses a resolution of 4096.

1.5gb is fine. More than that you risk problems, but there's a line you can add to fsx.cfg that limits VRAM access. You could rock a 3gb card (great for other things) and still make fsx see only 1 or 1.5gb.Edit: I don't remember the line, but a search of Ryan's posts should turn it up.

1.5gb is fine. More than that you risk problems, but there's a line you can add to fsx.cfg that limits VRAM access. You could rock a 3gb card (great for other things) and still make fsx see only 1 or 1.5gb. Edit: I don't remember the line, but a search of Ryan's posts should turn it up.

For a 1.5 GB the line would be [DISPLAY.Device.NVIDIA GeForce GTX 580.0]Mode=1920x1080x32VideoMemoryOverride=1610612736

Yep that's the one. If you were to install a 3gb card just add that VideoMemoryOverride line to your graphics card entry.

For a 1.5 GB the line would be [DISPLAY.Device.NVIDIA GeForce GTX 580.0]Mode=1920x1080x32VideoMemoryOverride=1610612736

Hi Julian, thanks for the info! Does anybody know if for a 1 GB videocard is needed to apply VideoMemoryOverride? Cheers.

Thanks guys for your advice. As I said in my op I have 8gb of ram and currently a 1gb graphics card. As I understand it an increase in graphic card ram will decrease the available ram for the CPU. So taking that into account, do you think that the NGX would run better with a max of 1 gb graphic card ram or is there a sweet spot between 1gb and 1.5gb and if so can you easily set that limit?

Hi Julian, thanks for the info! Does anybody know if for a 1 GB videocard is needed to apply VideoMemoryOverride? Cheers.

Yes, sure is. here is the number for a 1GB=1073741824

Thanks guys for your advice. As I said in my op I have 8gb of ram and currently a 1gb graphics card. As I understand it an increase in graphic card ram will decrease the available ram for the CPU. So taking that into account, do you think that the NGX would run better with a max of 1 gb graphic card ram or is there a sweet spot between 1gb and 1.5gb and if so can you easily set that limit?

I believe you set it to what memory your card has. Not random between 1 and 1.5, if that is what you mean.

Interesting. I got an ctd recently while FSX RAM reaching 2GB and my GFX card mostly under full load (also RAM mostly full). What's the number for 856 MB? How do you get that numbers?

Yes, sure is. here is the number for a 1GB=1073741824 I believe you set it to what memory your card has. Not random between 1 and 1.5, if that is what you mean.

No what I mean(from reading the above) is if I buy a card with 1.5gb of ram I presume I can set the max amount of graphic card ram used by FSX to any value up to 1.5gb. So am wondering what is the best trade off between graphic card ram and normal ram for FSX?

Yes, sure is. here is the number for a 1GB=1073741824 I believe you set it to what memory your card has. Not random between 1 and 1.5, if that is what you mean.

Thanks man! I've applied it and runs smoother!

What's the number for 856 MB?How do you get that numbers?

1 MB = 1024 bytes * 1024 = 1048576 bytes, so: 1 GB = 1 MB * 1024 = 1048576 * 1024 = 10737418241.5 GB = 1073741824 * 1.5 = 16106127362 GB = 1073741824 * 2 = 21474836483 GB = 1073741824 * 3 = 3221225472 and so on... For 856 MB. it's 0.785 GB, so then would be 1 GB * 0.875 = 1073741824 * 0.875 = 939524096 Cheers from Spain guys!

1 MB = 1024 bytes * 1024 = 1048576 bytes, so: 1 GB = 1 MB * 1024 = 1048576 * 1024 = 10737418241.5 GB = 1073741824 * 1.5 = 16106127362 GB = 1073741824 * 2 = 21474836483 GB = 1073741824 * 3 = 3221225472 and so on... For 856 MB. it's 0.785 GB, so then would be 1 GB * 0.875 = 1073741824 * 0.875 = 939524096 Cheers from Spain guys!

Thanks a bunch!

Thanks a bunch!

You're welcome!

I'm in a doubt that this tweak is working: GPU-Z is reporting the same amount of VRAM used. Am I doing anything wrong?

I kind of question this whole thread. As far as RAM, on a 64 bit system any RAM that is masked by hardware in the system address space is going to be remapped. As far as process address space, or VAS if you will, what I remember from Phil Taylor was that in FSX RTM they were storing FSX video memory copy in process address space AND the OS was storing it in the "upper 2Gb" address space reserved to the OS (or "upper 1 Gb" if /3GB set) . However what I recall is he said they got rid of that local copy in IIRC SP2. So on a x64 OS, all the video memory space for FSX is in the OS managed memory that is above the 4Gb that FSX gets.If I'm right then having large and/or SLI/Crossfire video RAM should not make a difference from an FSX process address space perspective (on x64 OS). scott s..